In the process of pipe construction and data accumulation in such industrial projects as synthetic ammonia&urea projects,the section calculation formula for solder consumption under different groove forms is derived based on various common welding groove section forms in the actual welding process.The formula is modified as per practical experience to summarize an optimized and simplified calculation formula that could generate calculation results close to the actual solder consumption.Practice shows that the solder consumption calculated by the simplified formula is very close to the actual usage,which simplifies the statistical process of solder amount calculation and improves its statistical efficien-cy.
The new manufacturing process of closure is related to the manufacturing process of various closure structures in the field of pressure vessels,and it features the advantages of accurate molding,high efficiency,safety and easy operation,regular shape and size of the closure,and great load-bearing capacity.The new closure manufacturing process is mainly based on hydraulic machinery and electromagnetic heating,using tooling to achieve mechanical forming of the closure,which can adapt to closure structure manufacturing in various pressure vessel equipment,and is especially suitable for large pressure vessel closure manufacturing.
The main engine arrangement sequence of a"motor-generator"steam-electricity double-drive feed pump set has been studied.The re-sult shows that the centered arrangement of"motor-generator"is the best scheme.The difference of pump performance in two models is dis-cussed,the maximum speed of pump is considered,during the pump dynamic analysis.The rotor and bearing of"motor-generator"are designed with increased load.The discussion shows that more reactive power is needed in the power generation case.The requirements of the start-up and shut-down sequences of the unit are discussed.After the unit is put into operation,stable operation and good performance are achieved,and the motor and power generation models are automatically switched smoothly.Finally,the fluctuation of power generation quantity and its influencing factors are analyzed,the result of which shows that the fluctuation of power grid frequency and that of operation slip ratio may be the causes.
A method of separating syngas via gas hydration to produce low carbon olefin product mixture is proposed.Such problems as water filling,heat transfer and temperature control in bubble bed hydration reactor are discussed,and the countermeasures are presented.All in all,the feasibility of separating syngas via gas hydration to produce low carbon olefin product mixture is discussed.
In the production of compound fertilizers,stable operation of the screening system is directly related to production continuity and prod-uct quality.Most of the traditional system adopts roller screen and vibrating screen types.The new plane rotary screen allows materials to quickly pass through,thanks to a specific reciprocating rotary motion mode and a low inclination of the screen surface.It features a larger effec-tive screening area,better screening efficiency and higher output.At the same time,it is equipped with self-tensioning and self-cleaning screen installation system to achieve the ideal screening effect for compound fertilizer production.After the plane rotary screen is applied to the screen-ing system,the granularity accuracy of the finished product is increased from 80%to more than 95%,the screening capacity is increased,and the product quality is also greatly improved.
